Questions tagged [summing]

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25 views

3-to-2 line encoder (or generally 2^(n-1)-to-n) — not priority, but telling how many inputs are on?

This is not homework (not taking any classes) although it could be homework. I am wondering what is the easiest implementation using a single TTL chip or gates (fewest chip count) to encode the number ...
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3answers
67 views

Summing Integrator cut off

I would like to know how to calculate cut off frequency of this summing integrator circuit. I fail to find anywhere on the internet how to calculate cut off frequency in this configuration. Then how ...
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1answer
130 views

How do you combine 2 AC power sources?

To combine 2 DC power sources, you can diode OR them both together. You can't just directly connect them together because their voltage outputs may differ ever-so-slightly, leading to imbalanced ...
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1answer
63 views

PSRR testing for LDO

This circuit diagram was taken from one of the TI application notes for testing PSRR of LDO. My question is about configuration of summing op-amp: What's the need of resistor in between the terminals ...
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3answers
85 views

Is there a limit to the number of inputs that can be summed with an op-amp summing circuit?

I'm interested in the limits you encounter if you try to add many inputs into an op amp summing circuit. I've read that the inverting configuration is more natural for adding many inputs since the ...
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0answers
29 views

Summing Audio Channels

I’m trying to sum my car stereo output. Factory output has bass on one output and mid and tweeter on another output giving me 2 channels for left and 2 channels for right. Ideally I’d like to sum ...
0
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1answer
68 views

Why is my mixer circuit lowering the signal?

I have made a really simple mixer, to be used with both audio and control signals in a modular system: This should if I understand it correctly give "about" 1:1 (1:0.99 in simulation) ratio beetween ...
0
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1answer
40 views

Voltage level shifter using opamp

I am making a circuit to acquire EOG signals and read it via the analog pin of Arduino. The arduino reads only positive signals, which is why I am unable to see the negative spikes in voltages caused ...
0
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2answers
90 views

Noise on stereo summing circuit from LED's

I've been a tinkerer and hobbyist for 20 years now, but mostly in software. I've done my fair share of simple soldering (replaced controller ports on an original Xbox with actual USB ports, for ...
2
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4answers
242 views

Non-inverting Op-Amp Audio Mixer

I am trying to make sense of the difference in non-inverting and inverting op-amp based audio "mixers". The circuits are basically summing op-amp amplifiers. Here is the part which I do not understand....
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0answers
38 views

Help in analysing circuit to show which resistor controls the differential gain

I understand the circuit to be a summing circuit but I am struggling to analyse past this point: Vout = R5 (((-R2/R1 * V2)/R4) * (V1 / R3)). can anyone analyse this further to prove that R5 is the ...
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2answers
54 views

Help with my design: How can I add these voltages?

I have to design a circuit that simulates a voltage spike on a dc supply rail. The circuit has a button that, when pressed, generates a short pulse of controllable height (controlled by pot). The ...
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4answers
3k views

How do solar inverter systems easily add AC power sources together? [closed]

I understand DC power more than AC power. I know that given multiple DC power generators, easiest way to sum them is by connecting them in series. In paralel you'd need every generator circuit to ...
4
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3answers
624 views

Don't individual signal sources affect each other when using a summing amplifier?

I am studying the book Electric Circuits by Nilsson & Riedel. There I learned about "summing amplifiers" and how to derive equations by applying KCL at inverting input of the op amp. I see that ...
0
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1answer
65 views

summing amp - floating inputs

I'm designing an audio mixer and currently i'm working on a cue section. The whole point is that i have 2 or more channels and want to mix them in summing mixer. You can turn off the channels you don'...
0
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1answer
121 views

Practical considerations for a summing amplifier

The summing (usually inverting) amplifier is a classic op amp configuration. However, I'm struggling to find any products on the market which actually do this, leading me to conclude that I have to ...
0
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1answer
222 views

Adding multiple differential signal

As I asked in "Adding multiple analog signal" before, I got that: for adding some signal together, we can only use op-amp, instead of lovely integrated circuit (ough). But the question arise because ...
2
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3answers
567 views

Mathematically derived waveform vs. captured waveform from an analog synthesizer

I was thinking about how the individual parameters on an analog synthesizer could be controlled digitally. What I mean is, instead of using mechanical potentiometers to adjust some quality of the ...
0
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2answers
142 views

Adding large numbers in context of analog computing?

I have been reading about analog computing yet have not been able to find material about a certain issue; in reference to arithmetic, it is said that op-amps are used to perform these tasks, for ...
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3answers
531 views

Connecting signal to multiple summing amplifiers

For a normal op-amp inverting summing amplifier, each signal is tied to the negative input of the op-amp. Imagine the scenario where I have three signals. In adder 1, I want to sum A and B. In adder 2,...
0
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1answer
141 views

Instrumentational Amplifier with Summing Amplifier

As you all know, most Inst. Amp. examples on the Internet have a 'Differential Amplifier' part as shown below. But, what would happen if a summing amplifier was used instead ? What kind of ...
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0answers
54 views

Summing Configuration Question

I'm building the following circuit in a PCB . The purpose is simple, the first stage is a TIA amplifier that converts current into voltage and its working fine. The second stage, where the problem is ...
0
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1answer
138 views

LTSpice simulation errors?

I ran this simulation in ltspice and my output voltage was -2.97V. According to my calculations I should have roughly -10V when all sources are at 5V. $$V_{out} = -V_{in}R_5 \left ( \frac{1}{R_1} + \...
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3answers
4k views

Accidentally downmixed stereo to mono, why does this work?

I have a cheap Chinese Bluetooth audio amplifier like this: It has four screw terminals for the speaker connections, namely L+, L-, R+ and R-. I accidentally connected a single speaker to L+ and R-, ...
2
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1answer
521 views

What's the best way to mute summed stereo channels?

I am building an audio mixer, and most of the instruments produce mono signals (internally split to L/R), but want to make sure it is flexible enough to use true stereo devices, and sum to mono in my ...
1
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3answers
345 views

How can I add high and low voltage signals to a high voltage DC offset?

It's only a theorethical question, since I'm not really going to build this circuit... I'm just curious, that's all. Anyway, thats my question! I have these signals: 3 kHz, 1V (peak) 20 Hz, ...
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3answers
223 views

Eliminating attenuation in summing box

Full disclosure: when it comes to electronics, I'm the type that knows enough to be dangerous. And that's kinda why I'm here - I took an electronics course in high school in 2005, but it's been a ...
1
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1answer
39 views

Does a Series Voltage Reference referencing more than one electrical block has to be buffered?

I'm planing to use a Series Voltage Reference,REF3330, as a voltage reference to three distinct parts of my circuit and i need an opinion regarding the way how to do it. First of all, the reference ...
0
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2answers
664 views

Can I use a Class D amplifier as a summing amplifier?

Context: I'm creating a mono, battery powered speaker. I'd like to sum the left and right channels of a stereo input signal into a mono output signal, which I feed into a Class-D Mono Audio Amplifier ...
0
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1answer
446 views

Summing amplifier with one op amp

I want to design amplifier that do the following summation $$V_o = 2V_1 +3V_2 +5V_3 $$ the difficult arose when design with one op-amp and all voltages are referenced to the ground . I tried with ...
0
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1answer
148 views

When to treat transformers as non-ideal?

For an experiment I need to sum a DC and AC Potential. My solution to this was to construct the following circuit: simulate this circuit – Schematic created using CircuitLab Testing this ...
8
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3answers
16k views

Inverting summing amplifier vs Non-inverting summing amplfier

As known there are inverting and non-inverting summing circuits, such as below: What's their cons and pros?
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3answers
2k views

Producing the Sum and Difference of two signals with two Op-Amps

I have two signals, one is a baseline voltage (V1) and the other is a 'difference' voltage (V2). From these I want to produce two signals, V1 + V2 and V1 - V2. The circuit I currently have is: ...
0
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1answer
872 views

Multisim and DAC (summing op amp)

I am using multisim to simulate an inverting summing op amp (LM741CN). I calculate my expected Vout to be the following: -Vout = ((20/2.5)V1) + ((20/5)V2) + ((20/10)V3) + ((20/20)V4). According to my ...
0
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1answer
569 views

How to measure the input impedance of a summing amplifier?

I have a summing amplifier set up like so, and I need to come up with a test to find the input impedance, I know because its a 741 IC that it will be in the region of 250k - 10 mil ohms, but don't ...
3
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2answers
362 views

Antenna sector power ratio (total power)

This is maybe a very basic question, which is driving me insane, because I can't remember the theory and neither I can seem to find any source about the topic. I have an antenna, whose SPR (sector ...
3
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0answers
372 views

Floating point addition. Are guard, round and sticky bit always necessaryl? analysis of a special case

I've a particular case of floating point addition. As you know for given floating point numbers \$x,y\$ one of the steps of the addition involves the fixed point sum: $$ s = 1.m_x + (-1)^{s_x \oplus ...
0
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1answer
465 views

Positive Feedback Of A Summing Amplifier

I've recently come across a topic that has not been covered in my studies (or at least not as yet). It's positive feedback of an amplifier. I have been reading this link on positive feedback. From ...
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3answers
427 views

Find v1 and v2 of a summing amplifier when it is in series with another Op-Amp

There is a summing amplifier with two AC power sources (v1+v2,) each connected to a different Ground. Each of these sources connect to a resistor (R1+R2,) and then to a summing point, which branches ...
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1answer
2k views

Why the op-amp is clipping the output signal even it is under the supply voltage? [closed]

I am just trying to build a mixer circuit to change stereo to mono using a summing circuit for a project. simulate this circuit – Schematic created using CircuitLab As shown by the drawing, I ...
16
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7answers
6k views

Is it possible to combine two 8 bits DACs together to create a 16 bit DAC, one byte of the 16 bit word shall be sent to each of them

For two DACs, one being sent D0-D7 and the other being sent D8-D15, with power supply being 5V, if 5V is added to output of 2nd DAC and then the two DAC outputs are summed, should result in a 16 bit ...
0
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1answer
500 views

TPA6111 Stereo power amplifier to mono setup

I have a TPA6111 stereo audio power amplifier part (http://www.ti.com/lit/ds/symlink/tpa6111a2.pdf) that has this typical application (from the datasheet): My application requires a mono signal ...
0
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1answer
899 views

Problem in DC offset with a summer op-amp

I've used this circuit as an input stage for a digital oscilloscope. From left to right, the first op-amp provides high input impedance, the second op-amp is used to add DC offset to the signal (which ...
1
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4answers
463 views

Summing amplifier with bypass

I am trying to sum three audio signals using a non-inverting summing amplifier as shown below. If I want to bypass one of those signals, what is the correct way of doing that (let's say with a switch)?...
0
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1answer
348 views

Summing Amp Response in a Cascaded Butterworth Notch Filter

I'm having trouble with a cascaded butterworth notch filter I'm designing and was hoping to get some insight on the summing amplifier stage at the end. I'm still a student, so my question may be a bit ...
1
vote
1answer
558 views

How can I add a stable DC voltage and a DC pulse train together?

For a project I am working on I need to take a DC voltage source, around 12V, with at least 1A of current, and I need to add it to a generated DC pulse train which will be from -4 to 4V and will be ...
0
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1answer
873 views

How to derive the transfer function of the Inverting Summing Amplifier?

I know that the transfer function of an inverting summing amplifier gives this, by using the Superposition principle: (for example with 2 input voltages) \$U_{ out }=-(\frac { R_{ 1 } }{ R_{ f } } U_{...
0
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1answer
953 views

Voltage follower/Buffer circuit as summing amp

Is that possible to use a voltage follower/buffer circuit as summing amp? In history, what kind of circuit was used for summing amp before people started to use those inverting summing amp circuit? -...
0
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3answers
1k views

Non Inverting Summing Amplifier - Ripple Gain

I've created the following non-inverting summing amp. This seems to sum flat DC fine although if I add ripple, the ripple get amplified, surely this should only add the ripple. Why is the ripple ...
0
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1answer
332 views

Analog to digital conversion: are natural number values possible with an amplifier?

I drew this circuit up for a project in Multisim. The inputs for V1 are -0.25 to 0.25, and the outputs are 0v to 10v. When -0.25v is inputted the output should equal 0v. But its giving me an output ...